On our realms server, we have consistently run into problems with realms not saving world data when we leave, this causes the server to reset to a state with hours of lost progress.
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Hi there!
Realms seems to be having tons and tons of issues after 1.16 has released. However, this bug has been around for nearly three years already, and this seems to be a duplicate ofΒ REALMS-401.
Make sure to do a quick search for your bug before posting it, and then vote for it, comment on it, and follow it. This is the best way for it to be prioritized by Mojang. Making a duplicate post means more work for the volunteers who help out to moderate and clean things up for the developers to look at and fix what needs to be fixed.
Also, this is a Realms-specific issue. For better results and for people who understand Realms better to see your issue, in the future, please post bugs specifically for Realms in the Realms project.

I'm also seeing this happen for the first time ever on the realm I play on. It started yesterday rolling back an hour + of progress, and again today rolling back about 30 min of progress. Hope they fix it soon as the game is unplayable with this happening.

Thank you for your report!
We're tracking this issue in REALMS-4218, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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This is somewhat similar to realmsΒ REALMS-401